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In the context of modeling spectral energy distributions (SEDs) for blazars, we extend the method that uses a convolutional neural network (CNN) to include external inverse Compton processes. The model assumes that relativistic electrons…

High Energy Astrophysical Phenomena · Physics 2024-02-13 N. Sahakyan , D. Bégué , A. Casotto , H. Dereli-Bégué , P. Giommi , S. Gasparyan , V. Vardanyan , M. Khachatryan , A. Pe'er

Modeling the broadband emission of blazars has become increasingly challenging with the advent of multimessenger observations. Building upon previous successes in applying convolutional neural networks (CNNs) to leptonic emission scenarios,…

High Energy Astrophysical Phenomena · Physics 2025-07-01 N. Sahakyan , D. Bégué , A. Casotto , H. Dereli-Bégué , V. Vardanyan , M. Khachatryan , P. Giommi , A. Pe'er

Multiwavelength observations are now the norm for studying blazars' various states of activity, classifying them, and determining possible underlying physical processes driving their emission. Broadband emission models became unavoidable…

High Energy Astrophysical Phenomena · Physics 2023-10-24 Olivier Hervet , Caitlin A. Johnson , Adrian Youngquist

Jets from supermassive black holes in the centers of active galaxies are the most powerful persistent sources of electromagnetic radiation in the Universe. To infer the physical conditions in the otherwise out-of-reach regions of…

High Energy Astrophysical Phenomena · Physics 2023-11-13 A. Tzavellas , G. Vasilopoulos , M. Petropoulou , A. Mastichiadis , S. I. Stathopoulos

Interpreting the spectral energy distributions (SEDs) of astrophysical objects with physically motivated models is computationally expensive. These models require solving coupled differential equations in high-dimensional parameter spaces,…

The broadband SEDs of blazars exhibit two broad spectral components, which in leptonic emission models are attributed to synchrotron radiation and synchrotron self-Compton (SSC) radiation of relativistic electrons. During high state phases,…

High Energy Astrophysical Phenomena · Physics 2015-05-30 Michael Zacharias , Reinhard Schlickeiser

The broadband spectral energy distribution(SED) of blazars is generally interpreted as radiation arising from synchrotron and inverse Compton mechanisms.Traditionally, the underlying source parameters responsible for these emission…

High Energy Astrophysical Phenomena · Physics 2018-04-04 S. Sahayanathan , A. Sinha , R. Misra

Single-zone synchrotron self-Compton and external Compton models are widely used to explain broad-band Spectral Energy Distributions (SEDs) of blazars from infrared to gamma-rays. These models bear obvious similarities to the homogeneous…

In this review, recent progress in theoretical models for the broadband (radio through gamma-ray) emission from blazars are summarized. The salient features of both leptonic and hadronic models are reviewed. I present sample modeling…

Cosmology and Nongalactic Astrophysics · Physics 2012-05-03 Markus Boettcher

(abr.) The spectral energy distribution (SED) of blazars typically has a double-humped appearance usually interpreted in terms of synchrotron self-Compton models. In proton blazar models, the SED is instead explained in terms of…

Astrophysics · Physics 2008-11-26 A. Muecke , R. J. Protheroe

We study the quasi-simultaneous Spectral Energy Distributions (SED) of 48 LBAS blazars, collected within three months of the Fermi LAT Bright AGN Sample (LBAS) data taking period, combining Fermi and Swift data with radio NIR-Optical and…

High Energy Astrophysical Phenomena · Physics 2009-12-21 S. Raino' , E. Cavazzuti , S. Colafrancesco , P. Giommi , A. Tramacere , the Fermi-LAT Collaboration

Blazars' non-thermal emission shows rapid variability across all wavelengths, so spectral energy distributions (SEDs) built from quasi-simultaneous data are crucial for revealing the jets physical properties. In this work, we construct…

High Energy Astrophysical Phenomena · Physics 2026-05-22 Yi Zhong , Zhujian Wan , Rui Xue , Hubing Xiao , Dingrong Xiong , Ze-Rui Wang

We model rapid variability of multifrequency emission from blazars occurring across the electromagnetic spectrum (from radio to gamma-rays). Lower energy emission is produced by the synchrotron mechanism, whereas higher energy emission is…

Astrophysics · Physics 2009-11-10 Andrei Sokolov , Alan P. Marscher , Ian M. McHardy

The one-zone synchrotron-self-Compton (SSC) model aims to describe the spectral energy distribution (SED) of BL Lac objects via synchrotron emission by a non-thermal population of electrons and positrons in a single homogeneous emission…

High Energy Astrophysical Phenomena · Physics 2013-08-19 Matteo Cerruti , Catherine Boisson , Andreas Zech

Observations of blazar flaring states reveal remarkably different variability time scales. Especially rapid flares with flux doubling time scales of the order of minutes have been puzzling for quite some time. Many modeling attempts use the…

High Energy Astrophysical Phenomena · Physics 2015-06-11 Michael Zacharias , Reinhard Schlickeiser

Multiwavelength observations of blazars such as Mrk 421 and Mrk 501 show that they exhibit strong short time variabilities in flare-like phenomena. Based on the homogeneous synchrotron self-Compton (SSC) model and assuming that time…

Astrophysics · Physics 2009-10-31 H. Li , M. Kusunose

The overall spectra (SED) of blazars, from radio to gamma-ray energies, seem to obey well defined trends, with a continuity of properties between blazars of different classes. To quantify this statement we can either investigate their…

Astrophysics · Physics 2007-05-23 Gabriele Ghisellini

Blazars host the most powerful persistent relativistic conical jet -- a highly collimated anisotropic flow of material/plasma. Motivated by this, we explore the blazar's broadband spectral energy distribution (SED) in an anisotropic flow of…

High Energy Astrophysical Phenomena · Physics 2021-06-14 Nagendra Kumar , Pankaj Kushwaha

A time-dependent Synchrotron Self Compton model (SSC) which is able to motivate the used electron spectra of many SSC models as a balance of acceleration and radiative losses is introduced. Using stochastic acceleration as well as Fermi-I…

High Energy Astrophysical Phenomena · Physics 2010-08-02 Matthias Weidinger , Felix Spanier

Blazars, a highly energetic subclass of jetted active galactic nuclei, show a broad band spectral energy distribution (SED) with two bumps, resulting from non-thermal jet emission. In 1998, an anticorrelation between the SED luminosity and…

High Energy Astrophysical Phenomena · Physics 2025-06-24 I. Viale , E. Prandini , C. Righi , F. Bovolon , N. Sahakyan
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